JP2017045522A - Vehicle lighting tool - Google Patents

Vehicle lighting tool Download PDF

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Publication number
JP2017045522A
JP2017045522A JP2015164745A JP2015164745A JP2017045522A JP 2017045522 A JP2017045522 A JP 2017045522A JP 2015164745 A JP2015164745 A JP 2015164745A JP 2015164745 A JP2015164745 A JP 2015164745A JP 2017045522 A JP2017045522 A JP 2017045522A
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Prior art keywords
light
lens
light guide
guide lens
prism surface
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JP2015164745A
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JP6608223B2 (en
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佐藤　浩二
Koji Sato
浩二 佐藤
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Stanley Electric Co Ltd
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Stanley Electric Co Ltd
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Priority to JP2015164745A priority Critical patent/JP6608223B2/en
Priority to US15/225,554 priority patent/US10024512B2/en
Priority to EP16182467.7A priority patent/EP3135990B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/24—Light guides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/236—Light guides characterised by the shape of the light guide
    • F21S43/237—Light guides characterised by the shape of the light guide rod-shaped
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/242—Light guides characterised by the emission area
    • F21S43/245—Light guides characterised by the emission area emitting light from one or more of its major surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/247—Light guides with a single light source being coupled into the light guide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/249—Light guides with two or more light sources being coupled into the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Physics & Mathematics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Planar Illumination Modules (AREA)

Abstract

PROBLEM TO BE SOLVED: To improve a light usage rate from a conventional use by frontwardly illuminating a front face of a light-guiding lens which is inclined in a front-rear direction.SOLUTION: A vehicle lighting tool 1 includes: a long light-guiding lens 3 inclined in a front-rear direction and extending along a base line S; a first LED 21 oppositely disposed at a front end of the light-guiding lens 3; and a reflective member 4 disposed on a rear side of the light-guiding lens 3. The light-guiding lens 3 includes a front face 32 substantially along the base line S and a rear face 33 on which a plurality of lens cuts 330 are formed. Each of the lens cuts 330 includes: a rear-side first prism face 331 rearwardly standing at a steep angle with respect to the base line S; and a front-side second prism face 332 formed in a flat plane shape substantially parallel to the front face 32. The reflective member 4 reflects the light rearwardly irradiated from the first prism face 331 of each of the lens cuts 330 toward the second prism face 332 of other lens cuts 330 positioned on a rear side of the above lens cuts 330.SELECTED DRAWING: Figure 3

Description

本発明は、車両に搭載される車両用灯具に関し、特に、前後方向に対して斜めに傾斜した長尺な導光レンズを前方向きに発光させる技術に関する。   The present invention relates to a vehicular lamp mounted on a vehicle, and more particularly to a technique for causing a long light guide lens inclined obliquely with respect to the front-rear direction to emit light forward.

従来、車両に搭載される車両用灯具として、長尺な導光レンズを発光させるものが知られている。この種の車両用灯具では、一般に、長手方向の側端面から導光レンズ内に入射した光を、その長手方向に沿って導光させつつ後面のレンズカットで反射させて前面から出射させることによって、当該導光レンズの前面を発光させている。   Conventionally, as a vehicular lamp mounted on a vehicle, one that emits light from a long light guide lens is known. In this type of vehicle lamp, in general, light that has entered the light guide lens from the side end surface in the longitudinal direction is reflected along the longitudinal direction while being reflected by the rear lens cut and emitted from the front surface. The front surface of the light guide lens emits light.

しかし、このような車両用灯具では、その前後方向に対して斜めに傾斜した方向に沿って導光レンズが配置された場合に、長手方向前側の側端面から導光レンズ内に入射した光を前方に向けて出射させることができず、ひいては導光レンズの前面を前方向きに発光させることができない。   However, in such a vehicular lamp, when the light guide lens is disposed along a direction inclined obliquely with respect to the front-rear direction, the light incident on the light guide lens from the side end surface on the front side in the longitudinal direction is The light cannot be emitted forward, and as a result, the front surface of the light guide lens cannot emit light forward.

具体的には、図６（ａ）に示すように、例えば右側から左側に向かって斜め後方へ傾斜した長尺な導光レンズの前面を発光させる場合、その長手方向前側の側端面と対向した光源（図示省略）からの光は、導光レンズに沿って斜め後方向きに当該導光レンズ内を導光する。そのため、この光を導光レンズの前面から前方向きに出射させるには、後面のレンズカットで鋭角に内部反射させなければならないが、その目的で単純にレンズカットの後側の面を急峻なものとすると、この面から後方へ光が抜けてしまう。したがって、光が抜けることを防止しようとすると、レンズカットの後側の面をあまり急峻には形成できず、結果として、導光レンズから前方向きに光を出射させることができない。   Specifically, as shown in FIG. 6A, for example, when the front surface of a long light guide lens inclined obliquely rearward from the right side to the left side is opposed to the side end surface on the front side in the longitudinal direction. Light from a light source (not shown) is guided through the light guide lens obliquely rearward along the light guide lens. Therefore, in order to emit this light forward from the front surface of the light guide lens, the rear lens cut must be internally reflected at an acute angle, but for this purpose, the rear surface of the lens cut is simply sharp. Then, light will escape backward from this surface. Therefore, if it is going to prevent light from escaping, the rear surface of the lens cut cannot be formed so steep, and as a result, light cannot be emitted forward from the light guide lens.

そこで、特許文献１に記載の車両用灯具では、導光レンズの後方に反射部材を配置し、導光レンズから後方に抜けた光を反射部材で反射させて導光レンズ内に再入射させることによって前方向きの光を得ている。より詳しくは、図６（ｂ）に示すように、導光レンズから後方へ一度抜けた光を、反射部材によって比較的に緩やかな角度で反射させ、レンズカットの前側の面で屈折させつつ導光レンズ内に再入射させた後に、このレンズカットの後側の面で前方へ内部反射させている。   Therefore, in the vehicular lamp described in Patent Document 1, a reflection member is disposed behind the light guide lens, and light that has passed through the light guide lens is reflected back by the reflection member and re-entered into the light guide lens. By getting the light forward. More specifically, as shown in FIG. 6B, the light once passed backward from the light guide lens is reflected at a relatively gentle angle by the reflecting member and refracted on the front surface of the lens cut. After being re-entered into the optical lens, it is internally reflected forward by the rear surface of the lens cut.

特開２０１１−１９８５３７号公報JP 2011-198537 A

しかしながら、上記特許文献１に記載の車両用灯具では、導光レンズ及び反射部材による比較的に緩やかな角度での屈折と反射を繰り返すことで前方向きの光を得ているため、光の屈折と反射の総回数が多くなっている。特に、より大きく光の向きを変える導光レンズへの再入射時には、同一のレンズカットによる屈折と反射が必要となっている。その結果、屈折と反射に伴う光のロスが大きくなり、光利用率が大きく低下してしまう。   However, in the vehicular lamp described in Patent Document 1, since light directed forward is obtained by repeating refraction and reflection at a relatively gentle angle by the light guide lens and the reflection member, The total number of reflections is increasing. In particular, when re-entering a light guide lens that changes the direction of light more, refraction and reflection by the same lens cut are required. As a result, light loss due to refraction and reflection is increased, and the light utilization rate is greatly reduced.

本発明は、上記課題を解決するためになされたもので、前後方向に対して傾斜した導光レンズの前面を前方向きに発光させるものであって、従来に比べて光利用率を向上させることができる車両用灯具の提供を目的とする。   The present invention has been made in order to solve the above-described problem, and emits the front surface of a light guide lens inclined with respect to the front-rear direction in a forward direction, and improves the light utilization rate as compared with the prior art. The purpose is to provide a vehicular lamp that can be used.

上記目的を達成するために、請求項１に記載の発明は、
前後方向に対して斜めに傾斜した方向に沿って延在するように配置された長尺な導光レンズと、
前記導光レンズの長手方向の前側の端部に対向配置された光源と、
前記導光レンズの後方に前記長手方向に沿って配置された反射部材と、
を備える車両用灯具であって、
前記導光レンズは、前記長手方向に略沿った前面と、前記長手方向に沿って並設された複数のレンズカットが形成された後面とを有し、
前記複数のレンズカットは、前記長手方向に対して急峻な角度で後方へ立ち上がる後側の第一プリズム面と、前記前面と略平行な平坦面状に形成されるとともに前記第一プリズム面の後端に連なる前側の第二プリズム面とをそれぞれ有し、
前記反射部材は、前記導光レンズの各レンズカットの前記第一プリズム面から後方へ出射した光を、当該レンズカットよりも後側に位置する他のレンズカットの前記第二プリズム面に向けて前方へ反射させることを特徴とする。 In order to achieve the above object, the invention described in claim 1
A long light guide lens arranged to extend along a direction inclined obliquely with respect to the front-rear direction;
A light source disposed opposite to the front end of the light guide lens in the longitudinal direction;
A reflective member disposed along the longitudinal direction behind the light guide lens;
A vehicular lamp comprising:
The light guide lens has a front surface substantially along the longitudinal direction and a rear surface on which a plurality of lens cuts arranged in parallel along the longitudinal direction are formed.
The plurality of lens cuts are formed in a rear first prism surface that rises rearward at a steep angle with respect to the longitudinal direction, a flat surface substantially parallel to the front surface, and the rear of the first prism surface. Each having a front second prism surface connected to the end,
The reflecting member directs light emitted backward from the first prism surface of each lens cut of the light guide lens toward the second prism surface of another lens cut located behind the lens cut. It is characterized by reflecting forward.

請求項２に記載の発明は、請求項１に記載の車両用灯具において、
前記導光レンズの長手方向の後側の端部に対向配置された他の光源を備え、
前記複数のレンズカットは、前記第二プリズム面の前端に連なる前側の第三プリズム面をそれぞれ有し、
前記第三プリズム面は、前記他の光源から前記導光レンズ内に入射して前側に向かって導光してきた光を前方に向けて内部反射させることを特徴とする。 The invention according to claim 2 is the vehicle lamp according to claim 1,
Another light source disposed opposite to the rear end of the light guide lens in the longitudinal direction;
Each of the plurality of lens cuts has a front third prism surface connected to a front end of the second prism surface,
The third prism surface is characterized in that the light incident on the light guide lens from the other light source and guided toward the front side is internally reflected toward the front.

請求項１に記載の発明によれば、光源から出射して長手方向前側の端部から導光レンズ内に入射した光が、当該導光レンズの長手方向に略沿ってその内部を導光した後に、後面の複数のレンズカットのうちの第一プリズム面から当該導光レンズの後方へ出射される。この光は、反射部材によって前方へ反射されて、当該光を出射させたレンズカットの後側に位置する他のレンズカットのうち、導光レンズの前面と略平行な平坦面状の第二プリズム面から当該導光レンズ内に再入射した後に、前面から前方へ出射される。
これにより、レンズカットの第二プリズム面を通じて屈折のみを生じさせつつ光を導光レンズ内に再入射させるので、この再入射の際に光の屈折と反射が必要であった従来に比べ、反射の回数を減らして光利用率を向上させることができる。
また、光を導光レンズ内に再入射させるレンズカットの第二プリズム面が、この再入射した光を出射させる前面と略平行な平坦面状に形成されているので、従来に比べて配光制御を容易かつ正確に行うことができ、ひいては光利用率をさらに向上させることができる。 According to the first aspect of the present invention, the light emitted from the light source and incident into the light guide lens from the end portion on the front side in the longitudinal direction has guided the inside thereof substantially along the longitudinal direction of the light guide lens. Later, the light is emitted from the first prism surface among the plurality of lens cuts on the rear surface to the rear of the light guide lens. This light is reflected by the reflecting member forward, and among the other lens cuts located on the rear side of the lens cut that has emitted the light, the flat prism-like second prism substantially parallel to the front surface of the light guide lens After re-entering the light guide lens from the surface, the light is emitted forward from the front surface.
As a result, the light is re-entered into the light guide lens while only causing refraction through the second prism surface of the lens cut. It is possible to improve the light utilization rate by reducing the number of times.
In addition, the lens-cut second prism surface that re-enters the light into the light guide lens is formed in a flat surface substantially parallel to the front surface from which the re-entered light is emitted. Control can be performed easily and accurately, and the light utilization rate can be further improved.

請求項２に記載の発明によれば、他の光源から出射して長手方向後側の端部から導光レンズ内に入射した光が、当該導光レンズの長手方向に略沿ってその内部を導光した後に、後面の複数のレンズカットのうちの第三プリズム面によって前方へ内部反射されて、前面から前方へ出射される。
これにより、第一プリズム面及び第二プリズム面を前側の光源用（の出射面及び再入射面）とし、第三プリズム面を後側の他の光源用として、各プリズム面の機能を独立させることができる。
したがって、各プリズム面をその機能に特化するよう個別に設計することができ、ひいては光利用率をより一層向上させることができる。 According to the second aspect of the present invention, the light emitted from another light source and entering the light guide lens from the end portion on the rear side in the longitudinal direction passes through the inside of the light guide lens substantially along the longitudinal direction. After the light is guided, the light is internally reflected forward by the third prism surface among the plurality of lens cuts on the rear surface and emitted forward from the front surface.
Thereby, the first prism surface and the second prism surface are used for the light source on the front side (the emission surface and the re-incidence surface), and the third prism surface is used for the other light source on the rear side, so that the function of each prism surface is made independent. be able to.
Therefore, each prism surface can be individually designed to specialize its function, and the light utilization rate can be further improved.

実施形態における車両用灯具の正面図である。It is a front view of the vehicular lamp in an embodiment. 図１のII−II線での断面図である。It is sectional drawing in the II-II line of FIG. 図２のＡ部の拡大図である。It is an enlarged view of the A section of FIG. 実施形態における車両用灯具の変形例を説明するための図である。It is a figure for demonstrating the modification of the vehicle lamp in embodiment. 実施形態における車両用灯具の他の変形例を説明するための図である。It is a figure for demonstrating the other modification of the vehicle lamp in embodiment. 従来の車両用灯具を説明するための図である。It is a figure for demonstrating the conventional vehicle lamp.

以下、本発明の実施形態について、図面を参照して説明する。
図１は、本実施形態における車両用灯具１の正面図であり、図２は、図１のII−II線での断面図であり、図３は、図２のＡ部の拡大図である。
なお、以下の説明において、「前」「後」「左」「右」「上」「下」との記載は、特に断りのない限り、車両用灯具１から見た方向、すなわち、当該車両用灯具１が搭載される図示しない車両から見た方向を意味するものとする。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a front view of a vehicular lamp 1 according to the present embodiment, FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1, and FIG. 3 is an enlarged view of a portion A in FIG. .
In the following description, “front”, “rear”, “left”, “right”, “upper”, and “lower” refer to the direction viewed from the vehicular lamp 1, that is, for the vehicle, unless otherwise specified. It means a direction viewed from a vehicle (not shown) on which the lamp 1 is mounted.

図１に示すように、車両用灯具１は、図示しない車両の前部左側に搭載されるヘッドランプであり、その前面を構成する素通しのアウターレンズ１０を備えている。アウターレンズ１０は、図示しない車両ボディの意匠ラインに沿って、平面視で左方（車両外側）に向かって斜め後方へ傾斜した形状に形成されており、本実施形態では、平面視で左右方向に対して約３８°左斜め後方へ傾斜している。このアウターレンズ１０に前方を覆われた灯室の内部には、主配光用の２つのランプユニット１１が収容されている。   As shown in FIG. 1, the vehicular lamp 1 is a headlamp mounted on the left side of a front portion of a vehicle (not shown), and includes a transparent outer lens 10 that constitutes the front surface thereof. The outer lens 10 is formed in a shape inclined obliquely rearward toward the left side (vehicle outer side) in a plan view along a design line of a vehicle body (not shown). In the present embodiment, the outer lens 10 is laterally viewed in a plan view. It is inclined about 38 ° diagonally backward to the left. Two lamp units 11 for main light distribution are accommodated inside the lamp chamber covered with the outer lens 10 in front.

また、灯室内の下部には、図２に示すように、２つのＬＥＤ（発光ダイオード）２と、導光レンズ３と、反射部材４とが収容されている。
このうち、２つのＬＥＤ２は、導光レンズ３を発光させる光源であり、導光レンズ３の右端面に発光面を対向させた第一ＬＥＤ２１と、導光レンズ３の左端面に発光面を対向させた第二ＬＥＤ２２とから構成されている。 Further, as shown in FIG. 2, two LEDs (light emitting diodes) 2, a light guide lens 3, and a reflecting member 4 are accommodated in the lower part of the lamp chamber.
Among these, the two LEDs 2 are light sources that cause the light guide lens 3 to emit light, and the first LED 21 having the light emitting surface opposed to the right end surface of the light guide lens 3 and the light emitting surface opposed to the left end surface of the light guide lens 3. The second LED 22 is made up of.

導光レンズ３は、長尺な棒状に形成されており、平面視で前後方向に対して斜めに傾斜した方向に略沿って延在した状態に配置されている。より詳しくは、導光レンズ３は、アウターレンズ１０に沿った（つまり平面視で左右方向に対して約３８°左斜め後方へ傾斜した）基準線Ｓに略沿うように、平面視で左方（車両外側）に向かって斜め後方へ傾斜した状態に配置されている。
また、本実施形態における導光レンズ３は、右端部（前端部）が屈曲部３０から右斜め後方へ屈曲されている。但し、この形状は、灯室内のレイアウト上の制約によるものであり、特に限定されるものではない。なお、以下では、特に断りのない限り、導光レンズ３のうち屈曲部３０よりも左側の部分（基準線Ｓに略沿った部分）について説明することとする。 The light guide lens 3 is formed in a long rod shape, and is arranged in a state extending substantially along a direction inclined obliquely with respect to the front-rear direction in plan view. More specifically, the light guide lens 3 is leftward in plan view so as to be substantially along the reference line S along the outer lens 10 (that is, inclined to the left and rearward by about 38 ° to the left and right directions in plan view). It is arranged in a state inclined obliquely rearward (to the vehicle outer side).
Further, the right end portion (front end portion) of the light guide lens 3 in the present embodiment is bent from the bent portion 30 to the right rear side. However, this shape is due to restrictions on the layout in the lamp chamber and is not particularly limited. In the following description, unless otherwise specified, a portion of the light guide lens 3 on the left side of the bent portion 30 (portion substantially along the reference line S) will be described.

導光レンズ３の左右両端面は、対向するＬＥＤ２から出射した光を当該導光レンズ３内に入射させる入光面３１となっている。この入光面３１は、対向するＬＥＤ２側へ膨出する凸面状に形成されており、当該ＬＥＤ２から出射した光を導光レンズ３の長手方向に沿うように集光させつつ当該導光レンズ３内に入射させる。   The left and right end surfaces of the light guide lens 3 serve as light incident surfaces 31 through which light emitted from the opposing LEDs 2 enters the light guide lens 3. The light incident surface 31 is formed in a convex shape that bulges toward the opposing LED 2, and condenses the light emitted from the LED 2 along the longitudinal direction of the light guide lens 3. Incidently enter.

導光レンズ３のうち、屈曲部３０よりも左側の部分の前面３２は、平面視で基準線Ｓに略沿いつつ前方への凸状にやや湾曲した長尺な湾曲平面状に形成されている。この前面３２は、導光レンズ３内から前方へ光を出射させる出射面であると同時に、入光面３１から導光レンズ３内に入射した光を内部反射（全反射）させる全反射面ともなっている。   The front surface 32 of the light guide lens 3 on the left side of the bent portion 30 is formed in a long curved flat shape that is slightly curved in a convex shape forward along the reference line S in plan view. . The front surface 32 is an emission surface that emits light forward from the light guide lens 3, and at the same time, is a total reflection surface that internally reflects (total reflection) the light incident from the light incident surface 31 into the light guide lens 3. ing.

導光レンズ３のうち、屈曲部３０よりも左側の部分の後面３３には、当該導光レンズ３の長手方向（つまり基準線Ｓ）に沿って連続的に並設された複数のレンズカット３３０が、その略全長に亘って形成されている。
各レンズカット３３０は、図３に示すように、上下方向に沿って一様な台形断面形状に形成されており、導光レンズ３の長手方向後側（左側）の第一プリズム面３３１と、長手方向中央の第二プリズム面３３２と、長手方向前側（右側）の第三プリズム面３３３とを有している。 A plurality of lens cuts 330 continuously arranged in parallel along the longitudinal direction of the light guide lens 3 (that is, the reference line S) on the rear surface 33 of the light guide lens 3 on the left side of the bent portion 30. However, it is formed over substantially the entire length.
As shown in FIG. 3, each lens cut 330 is formed in a uniform trapezoidal cross-sectional shape along the vertical direction, and the first prism surface 331 on the rear side (left side) in the longitudinal direction of the light guide lens 3; It has a second prism surface 332 in the center in the longitudinal direction and a third prism surface 333 on the front side (right side) in the longitudinal direction.

このうち、第一プリズム面３３１は、導光レンズ３の長手方向に対して急峻な角度で後方へ立ち上がる面となっており、より詳しくは、平面視で基準線Ｓに対して比較的に直角に近い角度α1（本実施形態では約６７°）だけ傾斜した面となっている。この第一プリズム面３３１は、右側の入光面３１から導光レンズ３内に入射してきた光を、やや屈折させつつ導光レンズ３の後方へ出射させる。
第二プリズム面３３２は、第一プリズム面３３１及び第三プリズム面３３３の各後端と滑らかに連なっており、導光レンズ３の長手方向に略沿った平坦面状に形成されている。つまり、第二プリズム面３３２と導光レンズ３の前面３２とは、平面視で互いに略平行となっている。この第二プリズム面３３２は、第一プリズム面３３１から導光レンズ３の後方へ出射して反射部材４で反射されてきた光を、当該導光レンズ３内に再入射させる
第三プリズム面３３３は、導光レンズ３の長手方向に対して比較的に緩やかな角度で後方へ立ち上がる面となっており、より詳しくは、平面視で基準線Ｓに対して角度α1よりも小さな角度α2（本実施形態では約３２°）だけ傾斜した面となっている。この第三プリズム面３３３は、左側の入光面３１から導光レンズ３内に入射してきた光を、前方に向けて内部反射（全反射）させる。 Among these, the first prism surface 331 is a surface that rises backward at a steep angle with respect to the longitudinal direction of the light guide lens 3. More specifically, the first prism surface 331 is relatively perpendicular to the reference line S in plan view. The surface is inclined by an angle α 1 (approximately 67 ° in the present embodiment) close to. The first prism surface 331 emits light that has entered the light guide lens 3 from the right light incident surface 31 to the rear of the light guide lens 3 while being slightly refracted.
The second prism surface 332 is smoothly connected to the respective rear ends of the first prism surface 331 and the third prism surface 333, and is formed in a flat surface shape substantially along the longitudinal direction of the light guide lens 3. That is, the second prism surface 332 and the front surface 32 of the light guide lens 3 are substantially parallel to each other in plan view. The second prism surface 332 causes the light emitted from the first prism surface 331 to the rear of the light guide lens 3 and reflected by the reflecting member 4 to re-enter the light guide lens 3. Is a surface that rises rearward at a relatively gentle angle with respect to the longitudinal direction of the light guide lens 3. More specifically, the angle α 2 is smaller than the angle α 1 with respect to the reference line S in plan view. The surface is inclined by about 32 ° in this embodiment. The third prism surface 333 internally reflects (totally reflects) the light that has entered the light guide lens 3 from the left light incident surface 31 toward the front.

反射部材４は、導光レンズ３の後面３３を覆うように、当該導光レンズ３のうち屈曲部３０よりも左側の部分の後方に近接されつつその長手方向に沿って配置されている。この反射部材４の前面には、導光レンズ３の後面３３の複数のレンズカット３３０間の窪みと噛み合うように突設された複数の反射突起４１が、導光レンズ３の長手方向に沿って断続的に並設されている。
各反射突起４１の前側（右側）の面は、導光レンズ３の各レンズカット３３０のうちの第一プリズム面３３１と対向する反射面４１１となっている。この反射面４１１は、平面視で基準線Ｓに対して角度α3（本実施形態では約５７°）だけ傾斜している。当該反射面４１１は、導光レンズ３の各レンズカット３３０の第一プリズム面３３１から後方へ出射した光を、当該レンズカット３３０よりも後側（本実施形態では後側２番目）に位置する他のレンズカット３３０の第二プリズム面３３２に向けて反射させる。 The reflection member 4 is disposed along the longitudinal direction of the light guide lens 3 so as to cover the rear surface 33 of the light guide lens 3 while being close to the rear of the left side of the bent portion 30 of the light guide lens 3. On the front surface of the reflecting member 4, a plurality of reflecting protrusions 41 are provided along the longitudinal direction of the light guiding lens 3 so as to be engaged with the recesses between the plurality of lens cuts 330 on the rear surface 33 of the light guiding lens 3. Intermittently arranged side by side.
The front (right side) surface of each reflection protrusion 41 is a reflection surface 411 facing the first prism surface 331 of each lens cut 330 of the light guide lens 3. The reflecting surface 411 is inclined with respect to the reference line S by an angle α 3 (about 57 ° in the present embodiment) in plan view. The reflection surface 411 is located behind the lens cut 330 (second rear side in the present embodiment) with respect to the light emitted backward from the first prism surface 331 of each lens cut 330 of the light guide lens 3. The light is reflected toward the second prism surface 332 of the other lens cut 330.

以上の構成を具備する車両用灯具１では、図２に示すように、２つのＬＥＤ２のうち、右側の第一ＬＥＤ２１から略放射状に出射した光が、導光レンズ３の右端の入光面３１を通じて集光されつつ当該導光レンズ３内に入射する。導光レンズ３内に入射した光は、導光レンズ３の屈曲部３０や前面３２によって、平面視で１〜３°の角度範囲で拡散されつつ、基準線Ｓに対してやや左斜め後方向きに角度β1（本実施形態では約１７°）だけ傾斜した方向に内部反射される。
この光は、図３に示すように、導光レンズ３後面３３の複数のレンズカット３３０のうち、導光レンズ３の長手方向に対して急峻な角度α1で後方へ立ち上がる第一プリズム面３３１から当該導光レンズ３の後方へ出射される。導光レンズ３から後方へ出射した光は、反射部材４前面の反射面４１１によって前方へ鋭角に反射された後に、出射してきたレンズカット３３０の後側２番目に位置する他のレンズカット３３０の平坦面状の第二プリズム面３３２を通じて、屈折されつつ導光レンズ３内に再入射する。そして、この光は、第二プリズム面３３２と略平行な導光レンズ３の前面３２を通じて前後方向に略沿うように屈折されつつ前方へ出射される。 In the vehicular lamp 1 having the above configuration, as shown in FIG. 2, the light emitted from the first LED 21 on the right side of the two LEDs 2 substantially radially is the light incident surface 31 on the right end of the light guide lens 3. Then, the light enters the light guide lens 3 while being condensed. The light that has entered the light guide lens 3 is diffused in an angle range of 1 to 3 ° in plan view by the bent portion 30 and the front surface 32 of the light guide lens 3 and slightly obliquely rearward with respect to the reference line S. Is internally reflected in a direction inclined by an angle β 1 (about 17 ° in the present embodiment).
As shown in FIG. 3, among the plurality of lens cuts 330 on the rear surface 33 of the light guide lens 3, this light rises rearward at a steep angle α 1 with respect to the longitudinal direction of the light guide lens 3. To the rear of the light guide lens 3. The light emitted backward from the light guide lens 3 is reflected by the reflective surface 411 on the front surface of the reflecting member 4 at an acute angle forward, and then the other lens cut 330 positioned second on the rear side of the emitted lens cut 330. The light enters the light guide lens 3 again while being refracted through the flat prismatic second prism surface 332. Then, the light is emitted forward while being refracted so as to be substantially along the front-rear direction through the front surface 32 of the light guide lens 3 substantially parallel to the second prism surface 332.

一方、２つのＬＥＤ２のうち、左側の第二ＬＥＤ２２から略放射状に出射された光は、図２に示すように、導光レンズ３の左端の入光面３１を通じて集光されつつ当該導光レンズ３内に入射する。このとき、導光レンズ３内に入射する光は、入光面３１によって、平面視で１〜３°の角度範囲で拡散しつつ、基準線Ｓに対してやや右斜め前方向きに角度β2（本実施形態では約３°）だけ傾斜した方向に沿うように集光される。
この光は、図３に示すように、導光レンズ３後面３３の複数のレンズカット３３０のうち、導光レンズ３の長手方向に対して比較的に緩やかな角度α2で後方へ立ち上がる第三プリズム面３３３によって前方に向けて内部反射される。そして、この光が、導光レンズ３の前面３２を通じて前後方向に略沿うように屈折されつつ前方へ出射される。 On the other hand, the light emitted from the second LED 22 on the left side of the two LEDs 2 substantially radially is condensed through the light incident surface 31 at the left end of the light guide lens 3 as shown in FIG. 3 is incident. At this time, the light incident on the light guide lens 3 is diffused by the light incident surface 31 in an angle range of 1 to 3 in a plan view, and is slightly obliquely forward to the reference line S at an angle β 2. The light is condensed along a direction inclined by about 3 ° in this embodiment.
As shown in FIG. 3, the light rises rearward at a relatively gentle angle α 2 with respect to the longitudinal direction of the light guide lens 3 among the plurality of lens cuts 330 on the rear surface 33 of the light guide lens 3. Internally reflected toward the front by the prism surface 333. Then, this light is emitted forward through the front surface 32 of the light guide lens 3 while being refracted so as to be substantially along the front-rear direction.

以上のように、本実施形態の車両用灯具１によれば、第一ＬＥＤ２１から出射して長手方向前側の右端部から導光レンズ３内に入射した光が、当該導光レンズ３の長手方向に略沿ってその内部を導光した後に、後面３３の複数のレンズカット３３０のうちの第一プリズム面３３１から当該導光レンズ３の後方へ出射される。この光は、反射部材４によって前方へ反射されて、当該光を出射させたレンズカット３３０の後側に位置する他のレンズカット３３０のうち、導光レンズ３の前面３２と略平行な平坦面状の第二プリズム面３３２から当該導光レンズ３内に再入射した後に、前面３２から前方へ出射される。
これにより、レンズカット３３０の第二プリズム面３３２を通じて屈折のみを生じさせつつ光を導光レンズ３内に再入射させるので、この再入射の際に光の屈折と反射が必要であった従来に比べ、反射の回数を減らして光利用率を向上させることができる。一般に、アクリルなどの導光部材では１回の屈折や反射によって数％のロスが生じるため、従来に比べて、このロス分に相当する光利用率の向上が期待できる。
また、光を導光レンズ３内に再入射させるレンズカット３３０の第二プリズム面３３２が、この再入射した光を出射させる前面３２と略平行な平坦面状に形成されているので、従来に比べて配光制御を容易かつ正確に行うことができ、ひいては光利用率をさらに向上させることができる。 As described above, according to the vehicular lamp 1 of the present embodiment, the light emitted from the first LED 21 and entering the light guide lens 3 from the right end on the front side in the longitudinal direction is the longitudinal direction of the light guide lens 3. The light is guided through the interior of the light guide lens 3 and then emitted from the first prism surface 331 of the plurality of lens cuts 330 on the rear surface 33 to the rear of the light guide lens 3. This light is reflected forward by the reflecting member 4 and is a flat surface substantially parallel to the front surface 32 of the light guide lens 3 among the other lens cuts 330 positioned on the rear side of the lens cut 330 from which the light is emitted. After re-entering the light guide lens 3 from the second prism surface 332 having a shape, the light is emitted forward from the front surface 32.
As a result, light is re-entered into the light guide lens 3 while causing refraction only through the second prism surface 332 of the lens cut 330, so that refraction and reflection of light were necessary at the time of this re-incidence. In comparison, the light utilization rate can be improved by reducing the number of reflections. In general, a light guide member made of acrylic or the like causes a loss of several percent due to one refraction or reflection. Therefore, an improvement in light utilization corresponding to the loss can be expected as compared with the conventional case.
In addition, since the second prism surface 332 of the lens cut 330 that re-enters the light into the light guide lens 3 is formed in a flat surface substantially parallel to the front surface 32 that emits the re-entered light. In comparison, light distribution control can be performed easily and accurately, and the light utilization rate can be further improved.

また、第二ＬＥＤ２２から出射して長手方向後側の左端部から導光レンズ３内に入射した光が、当該導光レンズ３の長手方向に略沿ってその内部を導光した後に、後面３３の複数のレンズカット３３０のうちの第三プリズム面３３３によって前方へ内部反射されて、前面３２から前方へ出射される。
これにより、第一プリズム面３３１及び第二プリズム面３３２を前側の第一ＬＥＤ２１用（の出射面及び再入射面）とし、第三プリズム面３３３を後側の第二ＬＥＤ２２用として、各プリズム面の機能を独立させることができる。
したがって、各プリズム面をその機能に特化するよう個別に設計することができ、ひいては光利用率をより一層向上させることができる。 Further, after the light emitted from the second LED 22 and incident on the light guide lens 3 from the left end portion on the rear side in the longitudinal direction is guided along the longitudinal direction of the light guide lens 3, the rear surface 33. The plurality of lens cuts 330 are internally reflected forward by the third prism surface 333 and emitted forward from the front surface 32.
Accordingly, the first prism surface 331 and the second prism surface 332 are used for the front first LED 21 (the emission surface and the re-incidence surface thereof), and the third prism surface 333 is used for the rear second LED 22 to each prism surface. The functions can be made independent.
Therefore, each prism surface can be individually designed to specialize its function, and the light utilization rate can be further improved.

さらに、光利用率の向上による副次的な効果として、点灯フィーリングの良化や導光レンズ３の長尺化、さらにはＬＥＤ２の消費電力低減やこれによる車両の燃費向上なども期待できる。
加えて、特に前側の第一ＬＥＤ２１の光利用率が向上するため、後側の第二ＬＥＤ２２の負担（出力）を軽減できる。そのため、当該第二ＬＥＤ２２のチップ数やヒートシンクなどを削減して、低コスト化や軽量化を図ることができる。 Further, as a secondary effect by improving the light utilization rate, it can be expected that the lighting feeling is improved, the light guide lens 3 is lengthened, the power consumption of the LED 2 is reduced, and the fuel efficiency of the vehicle is thereby improved.
In addition, since the light utilization rate of the front-side first LED 21 is particularly improved, the burden (output) of the rear-side second LED 22 can be reduced. Therefore, the number of chips and the heat sink of the second LED 22 can be reduced, and the cost and weight can be reduced.

なお、本発明を適用可能な実施形態は、上述した実施形態に限定されることなく、本発明の趣旨を逸脱しない範囲で適宜変更可能である。   The embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention.

例えば、上記実施形態では、レンズカット３３０の第一プリズム面３３１から導光レンズ３の後方へ出射された光が、反射部材４で反射されて、当該レンズカット３３０の後側２番目に位置する他のレンズカット３３０の第二プリズム面３３２から導光レンズ３内に再入射することとしたが、光を再入射させるレンズカット３３０は当該光を出射させるレンズカット３３０よりも後側に位置するものであればよく、例えば図４に示すように、その後側に隣接するものであってもよい。
但し、この場合には、導光レンズ３の各レンズカット３３０や反射部材４の各反射突起４１の形状等を適宜調整する必要があることは勿論である。例えば図４に示した例では、基準線Ｓに対し、レンズカット３３０の第一プリズム面３３１のなす角度α1が約９７°、第三プリズム面３３３のなす角度α2が約３２°、反射突起４１の反射面４１１のなす角度α3が約５０°となっている。またこの例では、前側の第一ＬＥＤ２１から導光レンズ３内に入射して後面３３に向かう光の角度β1が基準線Ｓに対して約１５°となっている。 For example, in the embodiment described above, the light emitted from the first prism surface 331 of the lens cut 330 to the rear of the light guide lens 3 is reflected by the reflecting member 4 and is located second on the rear side of the lens cut 330. Although the light enters the light guide lens 3 again from the second prism surface 332 of the other lens cut 330, the lens cut 330 that re-enters the light is positioned behind the lens cut 330 that emits the light. For example, as shown in FIG. 4, it may be adjacent to the rear side.
However, in this case, of course, it is necessary to appropriately adjust the shape of each lens cut 330 of the light guide lens 3 and each reflecting protrusion 41 of the reflecting member 4. For example, in the example shown in FIG. 4, with respect to the reference line S, the angle α 1 formed by the first prism surface 331 of the lens cut 330 is about 97 °, the angle α 2 formed by the third prism surface 333 is about 32 °, and reflected. The angle α 3 formed by the reflection surface 411 of the protrusion 41 is about 50 °. Further, in this example, the angle β 1 of light entering the light guide lens 3 from the front first LED 21 and traveling toward the rear surface 33 is about 15 ° with respect to the reference line S.

また、導光レンズ３の各レンズカット３３０や反射部材４の各反射突起４１の形状は、導光レンズ３の延在方向や、導光レンズ３と反射部材４との距離などに応じても、適宜調整する必要がある。
具体的には、例えば図５に示すように、導光レンズ３が上記実施形態よりも小さい角度（例えば平面視で左右方向に対して約１５°）で傾斜した方向（基準線Ｓ）に沿って延在している場合には、この基準線Ｓに対し、レンズカット３３０の第一プリズム面３３１のなす角度α1を約９７°、第三プリズム面３３３のなす角度α2を約３２°、反射突起４１の反射面４１１のなす角度α3を約３９°等に調整する必要がある。またこの図５の例では、前側の第一ＬＥＤ２１から導光レンズ３内に入射して後面３３に向かう光の角度β1が基準線Ｓに対して約１５°となっている。 Further, the shape of each lens cut 330 of the light guide lens 3 and each reflection protrusion 41 of the reflection member 4 also depends on the extending direction of the light guide lens 3, the distance between the light guide lens 3 and the reflection member 4, and the like. It is necessary to adjust appropriately.
Specifically, for example, as shown in FIG. 5, along the direction (reference line S) in which the light guide lens 3 is inclined at an angle smaller than that of the above embodiment (for example, about 15 ° with respect to the left-right direction in plan view). The angle α 1 formed by the first prism surface 331 of the lens cut 330 is about 97 ° and the angle α 2 formed by the third prism surface 333 is about 32 ° with respect to the reference line S. It is necessary to adjust the angle α 3 formed by the reflection surface 411 of the reflection protrusion 41 to about 39 ° or the like. In the example of FIG. 5, the angle β 1 of light entering the light guide lens 3 from the front first LED 21 toward the rear surface 33 is about 15 ° with respect to the reference line S.

また、車両用灯具１がヘッドランプであることとしたが、本発明に係る車両用灯具は、前後方向に対して斜めに傾斜した方向に沿って延在する長尺な導光レンズを前方向きに発光させるものであれば、ヘッドランプ以外のものにも好適に適用することができる。   Further, although the vehicular lamp 1 is a headlamp, the vehicular lamp according to the present invention has a long light guide lens extending forward along a direction inclined obliquely with respect to the front-rear direction. As long as it emits light, it can be suitably applied to other than the headlamp.

１ 車両用灯具
２ ＬＥＤ
２１ 第一ＬＥＤ（光源）
２２ 第二ＬＥＤ（他の光源）
３ 導光レンズ
３１ 入光面
３２ 前面
３３ 後面
３３０ レンズカット
３３１ 第一プリズム面
α1 角度
３３２ 第二プリズム面
３３３ 第三プリズム面
α2 角度
４ 反射部材
４１ 反射突起
４１１ 反射面
α3 角度
Ｓ 基準線 1 Vehicle lamp 2 LED
21 First LED (light source)
22 Second LED (other light source)
3 light guide lens 31 light incident surface 32 front surface 33 rear surface 330 lens cut 331 first prism surface α 1 angle 332 second prism surface 333 third prism surface α 2 angle 4 reflecting member 41 reflecting protrusion 411 reflecting surface α 3 angle S reference line

Claims (2)

前後方向に対して斜めに傾斜した方向に沿って延在するように配置された長尺な導光レンズと、
前記導光レンズの長手方向前側の端部に対向配置された光源と、
前記導光レンズの後方に前記長手方向に沿って配置された反射部材と、
を備える車両用灯具であって、
前記導光レンズは、前記長手方向に略沿った前面と、前記長手方向に沿って並設された複数のレンズカットが形成された後面とを有し、
前記複数のレンズカットは、前記長手方向に対して急峻な角度で後方へ立ち上がる後側の第一プリズム面と、前記前面と略平行な平坦面状に形成されるとともに前記第一プリズム面の後端に連なる前側の第二プリズム面とをそれぞれ有し、
前記反射部材は、前記導光レンズの各レンズカットの前記第一プリズム面から後方へ出射した光を、当該レンズカットよりも後側に位置する他のレンズカットの前記第二プリズム面に向けて前方へ反射させることを特徴とする車両用灯具。 A long light guide lens arranged to extend along a direction inclined obliquely with respect to the front-rear direction;
A light source disposed opposite to the front end of the light guide lens in the longitudinal direction;
A reflective member disposed along the longitudinal direction behind the light guide lens;
A vehicular lamp comprising:
The light guide lens has a front surface substantially along the longitudinal direction and a rear surface on which a plurality of lens cuts arranged in parallel along the longitudinal direction are formed.
The plurality of lens cuts are formed in a rear first prism surface that rises rearward at a steep angle with respect to the longitudinal direction, a flat surface substantially parallel to the front surface, and the rear of the first prism surface. Each having a front second prism surface connected to the end,
The reflecting member directs light emitted backward from the first prism surface of each lens cut of the light guide lens toward the second prism surface of another lens cut located behind the lens cut. A vehicular lamp characterized by being reflected forward. 前記導光レンズの長手方向の後側の端部に対向配置された他の光源を備え、
前記複数のレンズカットは、前記第二プリズム面の前端に連なる前側の第三プリズム面をそれぞれ有し、
前記第三プリズム面は、前記他の光源から前記導光レンズ内に入射して前側に向かって導光してきた光を前方に向けて内部反射させることを特徴とする請求項１に記載の車両用灯具。 Another light source disposed opposite to the rear end of the light guide lens in the longitudinal direction;
Each of the plurality of lens cuts has a front third prism surface connected to a front end of the second prism surface,
2. The vehicle according to claim 1, wherein the third prism surface internally reflects light that enters the light guide lens from the other light source and is guided toward the front side. Lamps.
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